A joint venture of two Spanish contractors, Obrascon Huarte Lain S.A. (OHL) and Dimetronic S.A., emerged May 17 as the low bidder for the Marmaray suburban rail upgrade project in Istanbul with a $1.5-billion bid.
The project to upgrade the city’s 140-year-old suburban train lines will create an uninterrupted high-capacity commuter rail system of 76.3 kilometers between the suburbs of Gebze on the Asian side and Halkalı on the European side. It will include a line running through an immersed tube tunnel currently being built under the Bosphorus Strait.